package com.yzdlb.image;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class NarrowImage {  
  
    /** 
     * @param im 
     *            原始图像 
     * @param resizeTimes 
     *            倍数,比如0.5就是缩小一半,0.98等等double类型 
     * @return 返回处理后的图像 
     */  
    public BufferedImage zoomImage(String src) {  
          
        BufferedImage result = null;  
  
        try {  
            File srcfile = new File(src);  
            if (!srcfile.exists()) {  
                System.out.println("文件不存在");  
                  
            }  
            BufferedImage im = ImageIO.read(srcfile);  
  
            /* 原始图像的宽度和高度 */  
            int width = im.getWidth();  
            int height = im.getHeight();  
              
            //压缩计算  
            float resizeTimes = 0.3f;  /*这个参数是要转化成的倍数,如果是1就是转化成1倍*/  
              
            /* 调整后的图片的宽度和高度 */  
            int toWidth = (int) (width * resizeTimes);  
            int toHeight = (int) (height * resizeTimes);  
  
            /* 新生成结果图片 */  
            result = new BufferedImage(toWidth, toHeight,  
                    BufferedImage.TYPE_INT_RGB);  
  
            result.getGraphics().drawImage(  
                    im.getScaledInstance(toWidth, toHeight,  
                            java.awt.Image.SCALE_SMOOTH), 0, 0, null);  
              
  
        } catch (Exception e) {  
            System.out.println("创建缩略图发生异常" + e.getMessage());  
        }  
          
        return result;  
  
    }  
      
     public boolean writeHighQuality(BufferedImage im, String fileFullPath) {  
            try {  
                /*输出到文件流*/  
                FileOutputStream newimage = new FileOutputStream(fileFullPath);  
                JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);  
                JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);  
                /* 压缩质量 */  
                jep.setQuality(0.9f, true);  
                encoder.encode(im, jep);  
               /*近JPEG编码*/  
                newimage.close();  
                return true;  
            } catch (Exception e) {  
                return false;  
            }  
        }  
       
       
     public static void main(String[] args) {  
           
         String inputFoler = "C:\\Users\\Carl\\Desktop\\Temp\\新建文件夹\\1.jpg" ;   
         /*这儿填写你存放要缩小图片的文件夹全地址*/  
        String outputFolder = "C:\\Users\\Carl\\Desktop\\Temp\\新建文件夹\\2.jpg";    
        /*这儿填写你转化后的图片存放的文件夹*/  
        
         
           
         NarrowImage narrowImage = new NarrowImage();  
         narrowImage.writeHighQuality(narrowImage.zoomImage(inputFoler), outputFolder);  
          
    }  
  
}  